21733406 has 8 divisors (see below), whose sum is σ = 32838480. Its totient is φ = 10787248.

The previous prime is 21733391. The next prime is 21733409. The reversal of 21733406 is 60433712.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21733409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39386 + ... + 39933.

It is an arithmetic number, because the mean of its divisors is an integer number (4104810).

Almost surely, 2^21733406 is an apocalyptic number.

21733406 is a deficient number, since it is larger than the sum of its proper divisors (11105074).

21733406 is a wasteful number, since it uses less digits than its factorization.

21733406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79458.

The product of its (nonzero) digits is 3024, while the sum is 26.

The square root of 21733406 is about 4661.9101235438. The cubic root of 21733406 is about 279.0675016419.

The spelling of 21733406 in words is "twenty-one million, seven hundred thirty-three thousand, four hundred six".